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FIELD GRAPHOMBTER. No. 351,690. Patented Oct. 26, 1886;

Wr/[zjma- UNITED STATES PATENT OFFICE.

ANTOINE OOSTIESOO, OF J ASSY, ROUMANIA.

'Fl EL'D-GRAPHOMETER.

EPECIPICAIION forming part of Letters Patent No. 351,690, dated October26, 1886.-

Application filed November 12, 1884. Serial No. 147.798. (NomoflelJPatented in France April 3, 1853, No. 154,649; in Belgium April 7,1883,No. 61,012; in Germany March 5, 1884, No.29,359; in Austria-HungaryMarch 6,1884, No. 9,293/954 and No. 22,385/875. 'and in Italy April1,1884, 16,675, XVIII, and 138, XXXIII.

T aZZ whom, it may concern.-

Beit known that I, ANTOINE Oos'rIEsco, of J assy, in the Kingdom ofRoumania,.have invented certain new and useful Improvements inField-Graphometers; and I do hereby declare that the following is afull, clear, and exact description of the invention, which will enableothers skilled in the art to which it appertains to make and use thesame, reference being bad to the accompanying drawings, which form apart of this specification, and in which- Figurel is a perspective Viewof my inn. proved field-graphometer. Fig. 2 is a plan view of thesame.Fig. 3 is a vertical transverse sectional view. Fig. 4 is a perspectiveview of the case in whichthe apparatus may be carried, and Fig. 5 is a"view illustrating the support or tripod in its various positions.

The same letters refer to the same parts in all the figures.

This invention relates to field-grapho meters and it has for its objectto provide a device or apparatus of this class which shall possesssuperior advantages in point of simplicity, durability, and generalefticiency, and which shall be conveniently portable and easilymanipulated.

With these ends in view the invention consists in the improvedconstruction and arrangement of parts which will be hereinafter fullydescribed, and particularly pointed out in the claims.

In the drawings hereto annexed, A designates the body of my improvedgraphometer, from the inner straight-edge of which extends asemicircularplate or body, B, the edge of which is provided with a rack, O, and theperiphery of which is laid out in half-degrees.

D D are pinules or sights provided with armsEE, by means of which theyare pivoted to the sides of the body A insucha manner asto be capable ofbeing folded down upon thelatter, as shown in Fig. 2 of the drawings,the said sights being arranged to register with the straight-edge of thesaid body A. The said body is provided with a spherical level, F,and

with an ordinary spirit-level, G, which willindicate when the device orapparatus is set in a horizontal plane.

The under side of the body A is provided with a universal joint; H,against the ball I of which bears the point of a thumb-screw, J,inserted from the upper side through the body A. which latter may thusbe adjusted to and retained in any desired position. The lower end ofthe said joint terminates in a socket, K,

by means of which it may be attached to the upper end of the support ortripod L (shown in Fig. 5) when it shall be desired to adjust theapparatus in position for operation.

Mounted upon the plate AB, concentrically with the semicircularextension B, is a compass, M.

N is an alidade mounted concentrically with the semi-circleBand compassM,and equipped with folding pinules, O O. The said alidade is equippedwith a Vernier or sliding scale, P,

' beveled to a feathenedge registering with the scale upon the peripheryof the semi-circle B, and graduated in suitable manner. It also has amagnifying-glass, Q, by means of which the Vernier may more readily beread, and a pinion, R, by means of which the said alidade may beconveniently adjusted.

S is a graduated "quadrant, extending from the end of the body or fixedalidade A concentrically with the semicircle B. The point of the alidadeN forms an indicator resting upon the said quadrant.

The under side of the body A B is equipped with a plumb-line, T,arranged concentrically with the semi-circle B, and it also has a casingcontaining a tape-measure, U.

V designates a suitable casing, constructed of leather or analogousmaterial, in which the apparatus, when not in use, may be COHVQD'.ientlycarried. A

From the foregoing description the operation of the apparatus will bereadily understood by those skilled in the art to which it appertains.It is simple in construction, accurate, and efiicient for all purposesfor which a device of this class is usually employed.

Having thus described my invention, Iclaim and desire to secure byLetters Patent of the United States- 1. A graphometer comprising thefixed alidade, mounted eccentrically to the semi-ci'rcle at its innerend upon a universal joint, and having a spherical level, aspirit-level, and

a plumb-line pending from the center of the semicircle, substantially asand for the purpose shown and set forth.

2. In a graphoineter, the fixed alidade having a graduated semi-circleextending from its straight-edge and provided with a rack at itsperiphery, in combination with the quadrant extending from the end ofthe said fixed ali- (lade concentrically with the semi-circle, and themovable alidade mounted concentrically with the semi-circle and having apinion engaging the rack upon the periphery oi the latter, substantiallyas and for the purpose set forth.

In agraphometer, the combination of the fixed alidade, the graduatedsemi-circle extending from the straightedge of the latter, and themovable alidade having a vernier beveled to a feather-edge andregistering with the scale of the semi-circle, and a magnifyingglassarranged above the said Vernier, su bstantially as and for the purposeset forth.

4. As an improvement in graphonn-ters, the

herein-described device comprising a body or fixed alidade, and having aspherical level and a spirit-level, a laterally-extending graduatedsemicircular plate having a rack at its periphery andmountedeccentrically upon a balland-socket joint, a compass secured centrallyupon the semicircular plate, a plumb-line pending from the center of thesaid plate, atapemeasure and a movable alidade having a vernierregistering with the scale of the semi-cirele, amagnifying-glassarranged above the said Vernier, and a quadrant extending from the endof the fixed alidade and read bythe point of the movable alidade,substantially as set forth.

In testimonythatl claim the foregoing I have hereunto set my hand this30th day of Jannary, 188i.

ANTOINE COSTIESCO.

Witnesses:

UAMILLE CI-IARROPIPIN, EMILE KANTER.

